<template>
	<div class="component-upload-image">
		<el-upload
			ref="imageUpload"
			:action="uploadImgUrl"
			:before-remove="handleDelete"
			:before-upload="handleBeforeUpload"
			:class="{ hide: fileList.length >= limit }"
			:file-list="fileList"
			:headers="headers"
			:limit="limit"
			:on-error="handleUploadError"
			:on-exceed="handleExceed"
			:on-preview="handlePictureCardPreview"
			:on-success="handleUploadSuccess"
			:show-file-list="true"
			list-type="picture-card"
			multiple
		>
			<el-icon class="avatar-uploader-icon">
				<plus />
			</el-icon>
		</el-upload>
		<!-- 上传提示 -->
		<div v-if="showTip" class="el-upload__tip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
			</template>
			的文件
		</div>

		<el-dialog v-model="dialogVisible" append-to-body title="预览" width="800px">
			<img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
		</el-dialog>
	</div>
</template>

<script lang="ts" setup>
import { ComponentInternalInstance } from "vue";
import { propTypes } from "@/utils/propTypes";
import { globalHeaders } from "@/utils/request";
import { removeFile } from "@/api/common";

const props = defineProps({
	modelValue: [String, Object, Array],
	// 图片数量限制
	limit: propTypes.number.def(5),
	// 大小限制(MB)
	fileSize: propTypes.number.def(5),
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: propTypes.array.def(["png", "jpg", "jpeg"]),
	// 是否显示提示
	isShowTip: {
		type: Boolean,
		default: true,
	},
});

const { proxy } = getCurrentInstance() as ComponentInternalInstance;
const emit = defineEmits(["update:modelValue"]);
const number = ref(0);
const uploadList = ref<any[]>([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + "/common/upload"); // 上传的图片服务器地址
const headers = ref(globalHeaders());//请求头

const fileList = ref<any[]>([]);
const showTip = computed(
	() => props.isShowTip && (props.fileType || props.fileSize),
);

const imageUploadRef = ref<ElUploadInstance>();

watch(() => props.modelValue, async val => {
	if (val) {
		// 首先将值转为数组
		let list: string[];
		if (Array.isArray(val)) {
			list = val as string[];
		} else if (typeof val === "string") {
			list = val.split(",");
		} else if (typeof val === "object" && val !== null) {
			list = Object.values(val).map(item => String(item));
		} else {
			list = [];
		}
		// 然后将数组转为对象数组
		fileList.value = list
			// 首先过滤掉包含 'blob' 的项
			.filter(item => !(typeof item === "string" && item.toLowerCase().includes("blob")))
			// 然后对剩余的项进行转换
			.map((item: any) => {
				if (typeof item === "string") {
					if (item.indexOf(baseUrl) === -1) {
						// 如果该项不包含 baseUrl，则在其前面加上 baseUrl
						return { name: baseUrl + item, url: baseUrl + item };
					} else {
						// 否则直接使用该项作为 name 和 url
						return { name: item, url: item };
					}
				}
				// 如果不是字符串类型（比如已经是对象），直接返回
				return item;
			});
	} else {
		fileList.value = [];
		return [];
	}
}, { deep: true, immediate: true });

/** 上传前loading加载 */
const handleBeforeUpload = (file: any) => {
	let isImg = false;
	if (props.fileType.length) {
		let fileExtension = "";
		if (file.name.lastIndexOf(".") > -1) {
			fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
		}
		isImg = props.fileType.some((type: any) => {
			if (file.type.indexOf(type) > -1) return true;
			if (fileExtension && fileExtension.indexOf(type) > -1) return true;
			return false;
		});
	} else {
		isImg = file.type.indexOf("image") > -1;
	}
	if (!isImg) {
		proxy?.$modal.msgError(
			`文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`,
		);
		return false;
	}
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}
	proxy?.$modal.loading("正在上传图片，请稍候...");
	number.value++;
};

// 文件个数超出
const handleExceed = () => {
	proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
	if (res.code === 200) {
		uploadList.value.push({ name: res.data.fileName, url: res.data.url });
		uploadedSuccessfully();
	} else {
		number.value--;
		proxy?.$modal.closeLoading();
		proxy?.$modal.msgError(res.msg);
		imageUploadRef.value?.handleRemove(file);
		uploadedSuccessfully();
	}
};

// 删除图片
const handleDelete = (file: UploadFile): boolean => {
	const findex = fileList.value.map(f => f.name).indexOf(file.name);
	let filePath = file.url;
	// 检查 file.url 是否包含 baseUrl
	if (filePath.includes(baseUrl)) {
		// 去掉 baseUrl
		filePath = filePath.replace(baseUrl, "");
	}
	let fileParam = {
		filePath: filePath,
	};
	removeFile(fileParam).then((res) => {
		if (res.code === 200) {
			proxy?.$modal.msgSuccess("删除成功");
		} else {
			proxy?.$modal.msgError(res.msg);
		}
	});
	if (findex > -1) {
		fileList.value.splice(findex, 1);
		emit("update:modelValue", listToString(fileList.value));
		return false;
	}
	return true;
};

// 上传结束处理
const uploadedSuccessfully = () => {
	if (number.value > 0 && uploadList.value.length === number.value) {
		fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
		uploadList.value = [];
		number.value = 0;
		emit("update:modelValue", listToString(fileList.value));
		proxy?.$modal.closeLoading();
	}
};

// 上传失败
const handleUploadError = () => {
	proxy?.$modal.msgError("上传图片失败");
	proxy?.$modal.closeLoading();
};

// 预览
const handlePictureCardPreview = (file: any) => {
	dialogImageUrl.value = file.url;
	dialogVisible.value = true;
};

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
	let strs = "";
	separator = separator || ",";
	for (let i in list) {
		// 检查 list[i] 是否有 url 属性，并且 url 中不包含 'blob'
		if (list[i].url && !list[i].url.toLowerCase().includes("blob")) {
			strs += list[i].url.replace(baseUrl, "") + separator;
		}
	}
	return strs != "" ? strs.substring(0, strs.length - 1) : "";
};
</script>

<style lang="scss" scoped>
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
	display: none;
}
</style>
